access_ok
#define user_access_begin(ptr, len) access_ok(ptr, len)
#define user_write_access_begin(ptr, len) access_ok(ptr, len)
if(access_ok(kek_add->EncryptKekBlob, sizeof(kek_blob))) {
if(access_ok(dek_add->dekBlob, sizeof(dek_blob))) {
if (!access_ok(u64_to_user_ptr(ex_hdr->response),